import Vue from 'vue'
import VueRouter from 'vue-router'

Vue.use(VueRouter)

const Login = () => import('../views/Login.vue')
const Home = () => import('../views/Home.vue')
const Welcome = () => import('../components/Welcome.vue')
const User = () => import('../components/user/user.vue')

const routes = [
  {
    path: '/',
    redirect: '/login'
  },
  {
    path: '/login',
    component: Login
  },
  {
    path: '/home',
    component: Home,
    redirect: '/welcome',
    children: [
      {
        path: '/welcome',
        component: Welcome
      },
      {
        path: '/users',
        component: User
      }]
  }
]

const router = new VueRouter({
  routes
})
router.beforeEach((to, from, next) => {
  // to:将要访问的路径
  // from:要去哪里
  // next:是一个函数,表示放行
  // next('/login') next()

  if (to.path === '/login') return next();

  // 获取token
  const tokenStr = window.sessionStorage.getItem('token')
  if (!tokenStr) return next('/login')
  next()
})
export default router
